VENT Passive Ventilation System Installed on Schoo

Hingaia Peninsula School in Karaka, Auckland recently built a large new extension which features a combination of classrooms and shared spaces. To mitigate the risk of internal moisture, the Ministry of Education specified a VENT passive ventilation system for the extension's long run skillion roof.

James Johnston, Commercial Manager of VENT explains that the company has been involved in a number of school rebuilds, extensions and reclads over the past couple of years. In the case of Hingaia Peninsula School, he is proud to have supplied a complete passive ventilation system. “The beauty of this project was that it was a complete four product combination. It’s the perfect system to create passive ventilation through the skillion roof cavity.”

The installed system features a G2500 over fascia vent, a VB20 vented batten, RV10P ridge vent, and a G1275 eaves comb filler — a combination of products that work together to ensure calculated airflow of 2500mm square per linear metre of air passing through the roof cavity.

The vented battens on top of the purlins ensure airflow is unimpeded through the roof cavity, while the ridge vent allows natural convection of warm moist air to escape the cavity. Where there is wind movement, the ridge vent also creates negative pressure to draw airflow through the roof cavity. While not a ventilation component, the eaves comb filler contributes by preventing any ingress of birds nesting in the roof cavity while still allowing airflow below roof cladding and above roof underlay.

Installation was completed by Reel Roofing, who took to installing the VENT products with ease. “It was a perfect specification and application from start to finish,” says Johnston.

Johnston is particularly pleased with the use of the full system of products as it will protect the building and occupants for years to come. ”It will prevent structural decay of building products and prevent the build-up of harmful moulds that could start to grow and fester in the roof cavity due to moisture. As a result, it contributes to creating a healthy environment for the kids who will be in the building every day.”

VENT’s passive ventilation system is a worthwhile investment in the school building as it will minimise future maintenance and ensure the longevity of the school extension. “Designed right, applied correctly, we know this roof is going to stand the test of time,” says Johnston

VENT Skillion Pitched Roof Ventilation System

VENT

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Through the design and installation of specific product combinations, an unimpeded passive roof space ventilation system is created.

These passive ventilation systems can be applied to all building types in all areas.

VENT's passive ventilation roofing systems allow a calculated amount of fresh air to enter the roof cavity.

Vent passive ventilation systems can be used with roof types such as long run, pressed metal, asphalt shingle and concrete tiles.

The system also works well with mechanical ventilation systems that are not externally ventilated i.e they do not ventilate from outside the building but from inside the roof cavity.

VENT's Passive Roof Ventilation Products comply with the following provisions of the NZ Building Code:

B1.3.1, B1.3.2
B1.3.3 (a)
B1.3.4 (a, b, c, d, e)
B2.3.1 (a)
B2.3.2 (a)

Evidence: All products are manufactured by Manthorpe Building Products Ltd (UK) who are ISO 9001 accredited by SGS Certificate # GB12/84769, certified since 2011.

VENT Eaves Comb Filler — G1275

VENT

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The G1275 VENT Eaves Comb Filler is designed with flexible fingers that adjust to fill the gaps left when using profiled tiles or steel roof cladding, preventing entry of birds and large insects.

Suitable for use in new and existing buildings within the following scope:

Up to 10m in height, and
With a risk score of less than 20, when evaluated against the E2/AS1 risk matrix, and
In wind zones up to extra high as defined in NZS 3604:2011, and
In all corrosion zones as defined in NZS3604:2011

The VENT Eaves Comb Filler can be used on all roof cladding types.

Compatible with VENT Over Fascia Vents (G1200N and G2500N)
Can be directly fixed to the fascia on top of the roof underlay

Successfully used for almost four decades in the UK and Europe.

Vent Ridge Vent — RV10P

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The VENT Ridge Vent is designed to release warm air from the roof void using the natural convection of rising warm air or by means of negative pressure created by wind blowing over the roof.

Appraised for use as non-structural roof battens and vents for use with pitched and skillion roof construction on buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and,
with profiled metal roof cladding; and,
situated in NZS 3604 Wind Zones up to, and including Extra High

The RV10P is designed to be compatible with roof cladding profiles with a trough depth of <38mm.

See BRANZ Appraisal 979 (2023) for full information.

In the opinion of BRANZ, Roof Ventilation Products, if designed, used, installed and maintained in accordance with the statements and conditions of this Appraisal, will meet or contribute to meeting the following provisions of the NZBC:

Clause B1 STRUCTURE: Performance B1.3.1, B1.3.2 and B1.3.4. Roof Ventilation Products meet the requirements for loads arising from gravity loads, wind and impact [i.e. B1.3.3 (b), (h) and (j)]
Clause B2 DURABILITY: Performance B2.3.1 (b) 15 years and B2.3.2. Roof Ventilation Products meet these requirements
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. Roof Ventilation Products contribute to meeting this requirement
Clause E3 INTERNAL MOISTURE: Performance E3.3.1. Roof Ventilation Products contribute to meeting this requirement
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Roof Ventilation Products meet this requirement

See BRANZ Appraisal 979 (2023) for full information.

BRANZ Appraised

Ventilation & Drainage Batten 20mm – VB20

VENT

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The VENT Vented Batten is a strong, durable purlin cavity batten that is designed to ensure that unimpeded airflow is guaranteed through the roof cavity of a Skillion Roof design, enabling passive airflow around the entire building envelope.

Roof Ventilation Products have been appraised for use as non-structural roof battens and vents for use with pitched and skillion roof construction on buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and,
with profiled metal roof cladding; and,
situated in NZS 3604 Wind Zones up to, and including Extra High.

The VENT Vented Batten (VB20) is designed for use on all skillion roof designs irrespective of the roof cladding. It can be used in all climates and weather conditions.

The VENT Vented Batten will fix to the top of the roof purlins, the upper edge of the fascia and underneath the barge flashing, and is compatible with steel and timber purlins.

Residential skillion roofing and commercial buildings
Designed to ensure that unimpeded airflow through the roof cavity of a skillion roof design
Also designed as a purlin vent to allow airflow throughout roof area
New build or renovation
VB20 can also be used on walls to create vertical or horizontal ventilation flows

See BRANZ Appraisal 979

Clause B1 STRUCTURE: Performance B1.3.1, B1.3.2 and B1.3.4. Roof Ventilation Products meet the requirements for loads arising from gravity loads, wind and impact [i.e. B1.3.3 (b), (h) and (j)]
Clause B2 DURABILITY: Performance B2.3.1 (b) 15 years and B2.3.2. Roof Ventilation Products meet these requirements
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. Roof Ventilation Products contribute to meeting this requirement
Clause E3 INTERNAL MOISTURE: Performance E3.3.1. Roof Ventilation Products contribute to meeting this requirement
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Roof Ventilation Products meet this requirement

See BRANZ Appraisal 979 (2023) for full information.

BRANZ Appraised

Over Fascia Vent 25mm — G2500N

VENT

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The VENT Over Fascia Vent (G2500N) is a practical and cost efficient method of ventilating the Eaves.

Suitable for use in new and existing buildings within the following scope:

Up to 10m in height, and
With a risk score of less than 20, when evaluated against the E2/AS1 risk matrix, and
In wind zones up to extra high as defined in NZS 3604:2011, and
In all corrosion zones as defined in NZS3604:2011

Recommended for cold roofs with a pitch under 15° and any skillion roof design.

The VENT Over Fascia Ventilator should be screw fixed to the top of the fascia through the fixing holes provided along the full length of the eaves. It will fix along the top edge of any flat top fascia profile and is compatible with steel and timber fascias.

Use in conjunction with other products from the VENT range to provide a complete roof ventilation system. Such as:

The VENT Ridge Vent (RV10P) and VENT Vented Batten (VB20) for any pitch skillion roof
The VENT Vented Batten (VB20) for any degree mono pitch skillion roof

Blue Building Solutions Passive Roof Ventilation Products comply with the following provisions of the NZ Building Code:

B1 Structure: 1.3.1, B1.3.2, B1.3.3(a), B1.3.4 (a, b, c, d, e)
B2 Durability: B2.3.1(a), B2.3.2(a)

All products are manufactured by Manthorpe Building Products Ltd (UK) who are ISO 9001 accredited by SGS Certificate # GB12/84769, certified since 2011.

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